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There are some commercial and industrial buildings which now surpass sixty stories or more. These buildings all require tall cranes to help move the supplies to the upper floors. There are cranes that are operated from the back of trucks or other kinds that have their own vehicle connected. Tower cranes are the largest kinds offered on the market.
Tower cranes are the stand-alone structures which are usually found on high-rise building projects. Often, they are part of a major city's downtown skyline. When new construction like skyscrapers or apartment buildings and commercial facilities like for instance shopping center are being constructed, chances are a crane will be on site.
Kinds
There are two different types of cranes: jib crane of the boom crane. The jib is a metal frame which extends from the main section. On a flat tower crane, the jib remains horizontal when it carries items. On a luffing type of tower crane, the jib can ratchet to upward or downward angles. The lifting capacity for both types can vary from 30 pounds to 10,000 lbs.
Body
The crane's body is composed of a vertical steel mast that is composed of separate [parts. The parts are added to increase the overall height of the machinery. The mast extends upward to where the desired height is, to the control module, that is a small room which has glass windows on all four sides or to the tower as it is also called. The crane driver works from inside of the tower.
Lift
The crane uses a braided metal cord to be able to lift supplies. This cord extends out from a motor situated next to the control module to the end of the boom or jib. There is a pulley system located at the end of the jib, through which the cord is positioned and lowered down. The jib that holds the cord becomes balanced by a counter jib located on the opposite side of the tower. The counter jib has weights. These weights help to prevent the crane from toppling over when lifting heavy supplies.
The hydraulic truck crane is a specialized mobile crane which uses hydraulic power to lift and move thousands of pounds. Hydraulics uses forces being transmitted through oil pushing in opposite directions on the pistons of the boom in order to lift thousands of pounds. Hydraulic truck cranes are really important in constructing major projects like for example bridges, airports, roads and buildings. A crane could complete in minutes jobs that will normally take lots of hours and hundreds of men to accomplish.
These remarkable machinery have played a very important part in constructing houses, cities, individual buildings and entire nations throughout the ages. Even Egypt's Great Pyramids were probably constructed with the help of basic cranes to allow the heaviest supplies in one of the most awesome construction projects of all time.
The very first representation of a crane was showcased during the reign of King Ramses in Egypt during 3000 B.C. This was a portrayal of a lifting mechanism that was used to collect water. The very first official "cranes" appeared in Ancient Greece. These mechanism were utilized to create an entire nation throughout the 5th century B.C.
Initially, cranes were first made out of wood. It wasn't until the designers constructing dockyards decided they needed something stronger and larger did these machinery develop. Hick & Rothwell developed the first cast iron cranes in Bolton, England, in eighteen thirty four. This machinery was capable of lifting as much as 2 tons. That very same year, wire ropes were added to the crane by an Official of the German Superior Board, Herr Albert Sr. The wire rope made the crane stronger and more durable. This addition enabled cranes to have a larger capacity to lift heavy weights.
Eventually, the wire ropes were weaved together to be able to form an even more powerful strength. This wire formation also brought the added benefit of flexibility. 4 years later, Germany started to build cast iron cranes. The very first cast iron crane built by Germany was built within Neuburg.
